mvebu: armada-37xx: add patch to forbid cpufreq for 1.2 GHz

mvebu: armada-37xx: add patch to forbid cpufreq for 1.2 GHz

This patch is backported from linux-arm-kernel [1] to improve situation, when
it was reported that 1.2 GHz variant is unstable with DFS.
It waits to be accepted upstream, however, it waits for Marvell people to respond.

[1] https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210630225601.6372-1-kabel@kernel.org/

Fixes: 7b868fe04a89 ("Revert "mvebu: 5.4 fix DVFS caused random boot crashes"")
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>